<!DOCTYPE html>
<html lang="zh">
  <head>
    <meta charset="UTF-8">
    <title>{% block title %}{% endblock %}</title>
      <!--bootstrap css js jquery-->
    <link href="https://cdn.bootcss.com/twitter-bootstrap/4.1.3/css/bootstrap.css" rel="stylesheet">
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
    <script src="https://cdn.bootcss.com/twitter-bootstrap/4.1.3/js/bootstrap.js"></script>
  </head>
  <body>
    {% block content %}
    {% endblock %}
  </body>
</html>